Preventing the formation of scale in steam-boilers



(No Model.)

E. MATEEE.

PREVENTING THE FORMATION OF SCALE IN STEAM BOILERS.

No. 372,985. Patented Nov. 8, 1887.

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UNITED STATES PATENT Orricn.

EDMUND MATHER, OF HARRISBURG, PENNSYLVANIA.

PREVENTING THE FORMATION OF SCALE IN STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 372,985, dated November 8, 1887. Application filed June 14, 1887. Serial No. 241,279. (No model.)

and useful Improvements in Means for Preventing the Formation of Scale in Steam-Boilers; and I do hereby declare the following to be aifull, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the figures and letters of reference marked thereon.

The formation of scale, so called, in steam-boilers is due to the deposition of mat ter held mechanically or chemically in solution by the water introduced in the boiler and precipitated upon the tubes and sheets and there baked or hardened by the action of heat.

Various modes have been suggested and practiced for getting rid of this scale or preventing its formation; but the plan most generally adopted is to inject into the boiler some chemical solution which is apt to be as harmful and destructive in its action upon the boiler as the scale itself.

Now, it is the object of my invention to provide within the boiler a suitable trough or receptacle for primarily receiving the feedwater introduced into the boiler and collecting the sediment or matter precipitated from said water in the steam-making process, and in pro viding suitable blow-off appliances in connection with said receptacle, whereby the matter so collected may be entirely and effectually removed as often as may be found desirable by the simple turning of a cook. The reeeptaole referred to is so far removed from the parts of the boiler to which heat is applied as not to be subjected to the direct action thereof, by which provision the sediment or matter precipitated and collected is not formed or baked into scale, but is left in such condition as to be readily drawn off or removed when the blow-off cock is opened.

Referring to the accompanying drawings, Figure 1 represents a longitudinal section of a steam-boiler to which my invention in one of its forms is applied. Fig. 2 is a cross-sectional view of the same. Fig. 3 is a plan view of the trough or receptacle detached.

Similar letters of reference in the several figures indicate the same parts.

The letter A represents the shell of the boiler, and B the tubes thereof. Above or below, but preferablybelow them, as shown, I arrange a trough or receptacle, 0, preferably of coneavoconvex form in crosssection, and extending nearly the whole length of the boiler, being supported on suitable legs, D, which serve to keep it from contact with the shell. This trough or receptacle is provided with an angular false bottom, E, which extends its entire length and is provided, at or near its junction with the bottom proper of said trough, with a series of openings, 6, and at the end of the trough there is connected a blow-off pipe, G, which opens into the space between the false bottom and bottom proper, as shown in Figs. 1 and 2.

H represents the feed -water pipe, which may enter from the top, side, or any other part ofthe boiler, as desired, and I is a perforated distributing-pipe connected to said feed-water pipe and extending longitudinally over and substantially parallel to the trough, as shown. The perforations in this pipe I are so arranged as to cause the water discharged from said pipe toimpinge upon the bottom of the trough, as shown in dotted lines, Fig. 2.

In the operation of the invention the trough serves, first, to collect and retain any matter brought in with the feed-water, and, secondly, as a collector of the matter precipitated from the water in the steam-making process, it being well known that matter so precipitated naturally becomes deposited in those portions of the boiler where there is the least disturbance from ebullition, and this trough furnishing an instance of such a comparatively quiet portion.

The top surface of. the false bottom is constructed at such an angle as that the matter falling upon it will be deflected onto the bottom proper; and at suitable intervals of time,

when the accumulation upon the bottom has will be drawn off through all the openings 0 at once, care should be taken that the area of the blow-off pipe should equal or exceed the combined area of said openings 0.

A man-hole, K, is provided for the easy introduction and removal ofthe trough, as shown in Fig. 1.

Having thus described my invention, what I claim as new is- 1. The combination, with a steam-boiler, of an open-topped receptacle kept removed from the portion of the boiler subjected to the direct action of the fire, a feed-water pipe located slightly above said receptacle and discharging water therein through perforations in its under side, and a blow-off for removing sediment in said receptacle, substantially as described.

2. The combination, with a steam-boiler, of the openmouthed independent receptacle having an outwardly-sloping-sided false bottom, perforations located at the intersection of said false bottom and sides of the receptacle, and the blow-off connnunicating with the space beneath said false bottom, as set forth.

3. The combination, with the steam-boiler, of an independent sediment-receptacle having the perforated false bottom, and a blow-01f communicating with the space below the same, the area or discharging capacity of which equals or exceeds the aggregate areas or discharging capacity of the perforations in said false bottom, substantially as described.

4. The combination, with a steam'boiler, of the independent receptacle having the perforated false bottom, the blow-off pipe, and the perforated feed-water pipe located slightly above the said receptacle and discharging water therein, substantially as described.

EDMUND MATHER.

Witnesses:

R. S. CARE, M. W. .Lxcons. 

